android：给图片打水印

现在是维护知识产权的时代，很多时候app展示的图片会要求打上水印以强调自己对图片的知识产权。现在道长给大家分享一下给图片打水印的方法。额，这里道长已经写成一个简单的工具类。先把工具类的代码贴上：

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;/*** Created by yushan on 2017-5-18.*/public class WatermarkHelper {private int imagePositionX = 0;private int imagePositionY = 0;private Bitmap src;private Bitmap watermark;private static Context mContext;private static WatermarkHelper watermarkHelper;public static final int WATERMARK_WITH_IMAGE = 120;public static final int WATERMARK_WITH_WRITE = 121;public static final int WATERMARK_WITH_IMAGE_AND_WRITE = 122;private String msg = "";private int mTextSize = 16;private int mTextColor = Color.BLACK;private int textPositionX = 0;private int textPositionY = dip2px(mContext, mTextSize);private WatermarkHelper() {}/*** 获取WatermarkHelper实例* @param context* @return*/public static WatermarkHelper getIntense(Context context) {mContext = context;watermarkHelper = new WatermarkHelper();return watermarkHelper;}/*** 设置背景图片* @param srcImageId* @return*/public WatermarkHelper setSourceImage(int srcImageId) {src = drawable2Bitmap(mContext, srcImageId);return watermarkHelper;}/*** 设置水印图片* @param watermarkId* @return*/public WatermarkHelper setWaterImage(int watermarkId) {watermark = drawable2Bitmap(mContext, watermarkId);return watermarkHelper;}/*** 设置水印图片位置* @param positionX* @param positionY* @return*/public WatermarkHelper setWatermarkPosition(int positionX, int positionY) {imagePositionX = dip2px(mContext, positionX);imagePositionY = dip2px(mContext, positionY);return watermarkHelper;}/*** 设置水印文字* @param message* @return*/public WatermarkHelper setWatermarkText(String message){msg = message;return  watermarkHelper;}/*** 设置水印文字大小* @param textSize* @return*/public WatermarkHelper setWatermarkTextSize(int textSize){mTextSize = textSize;return watermarkHelper;}/*** 设置水印文字颜色* @param textColor* @return*/public WatermarkHelper setWatermarkTextColor(int textColor){mTextColor = textColor;return watermarkHelper;}/*** 设置文字水印位置* @param positionX* @param positionY* @return*/public WatermarkHelper setWatermarkTextPosition(int positionX, int positionY){textPositionX = dip2px(mContext, positionX);textPositionY = dip2px(mContext, positionY);return watermarkHelper;}/*** 获取打上水印的图片* @param resultId* @return*/public Drawable getMarkedImage(int resultId) {Drawable newDrawable = null;switch (resultId){case WATERMARK_WITH_IMAGE:newDrawable = drawImage2Bitmap();break;case WATERMARK_WITH_WRITE:newDrawable = drawText2Bitmap();break;case WATERMARK_WITH_IMAGE_AND_WRITE:newDrawable = drawImgAndText2Bitmap();break;default:break;}if (newDrawable == null) {return null;}return newDrawable;}/*** 绘制带图片水印的图片* @return*/private Drawable drawImage2Bitmap() {if (src == null) {throw new NullPointerException();}int srcWidth = src.getWidth();int srcHeight = src.getHeight();// create the new blank bitmapBitmap newBitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888);Canvas canvas = new Canvas(newBitmap);// draw src intocanvas.drawBitmap(src, dip2px(mContext, 0), dip2px(mContext, 0), null);// draw watermark intoif (watermark != null) {canvas.drawBitmap(watermark, imagePositionX, imagePositionY, null);}// save all clipcanvas.save(Canvas.ALL_SAVE_FLAG);// storecanvas.restore();Drawable newDrawable = bitmap2Drawable(newBitmap);return newDrawable;}/*** 绘制带文字水印的图片* @return*/public Drawable drawText2Bitmap() {if (src == null) {throw new NullPointerException();}// deal text position at Yif (mTextSize != 16 && textPositionY == dip2px(mContext, 16)){textPositionY = dip2px(mContext, mTextSize);} else if (mTextSize != 16 && textPositionY != dip2px(mContext, 16)){textPositionY = textPositionY + dip2px(mContext, mTextSize);}// resource bitmaps are imutable,// so we need to convert it to mutable onesrc = src.copy(src.getConfig().ARGB_8888, true);Canvas canvas = new Canvas(src);canvas.drawBitmap(src, 0, 0, null);// new antialised PaintPaint paint = new Paint(Paint.ANTI_ALIAS_FLAG);// text colorpaint.setColor(mTextColor);paint.setTextSize(dip2px(mContext, mTextSize));paint.setDither(true); //获取跟清晰的图像采样paint.setFilterBitmap(true);//过滤一些Rect bounds = new Rect();paint.getTextBounds(msg, 0, msg.length(), bounds);canvas.drawText(msg, textPositionX, textPositionY, paint);Drawable drawable = bitmap2Drawable(src);return drawable;}/*** 绘制带图片和文字水印的图片* @return*/public Drawable drawImgAndText2Bitmap() {if (src == null) {throw new NullPointerException();}// deal text position at Yif (mTextSize != 16 && textPositionY == dip2px(mContext, 16)){textPositionY = dip2px(mContext, mTextSize);} else if (mTextSize != 16 && textPositionY != dip2px(mContext, 16)){textPositionY = textPositionY + dip2px(mContext, mTextSize);}// resource bitmaps are imutable,// so we need to convert it to mutable onesrc = src.copy(src.getConfig().ARGB_8888, true);Canvas canvas = new Canvas(src);canvas.drawBitmap(src, 0, 0, null);// new antialised PaintPaint paint = new Paint(Paint.ANTI_ALIAS_FLAG);// text colorpaint.setColor(mTextColor);paint.setTextSize(dip2px(mContext, mTextSize));paint.setDither(true); //获取跟清晰的图像采样paint.setFilterBitmap(true);//过滤一些Rect bounds = new Rect();paint.getTextBounds(msg, 0, msg.length(), bounds);canvas.drawText(msg, textPositionX, textPositionY, paint);// draw watermark intoif (watermark != null) {canvas.drawBitmap(watermark, imagePositionX, imagePositionY, null);}// save all clipcanvas.save(Canvas.ALL_SAVE_FLAG);// storecanvas.restore();Drawable drawable = bitmap2Drawable(src);return drawable;}/*** drawable转换为Bitmap* @param context* @param drawableId* @return*/private static Bitmap drawable2Bitmap(Context context, int drawableId) {if (drawableId == -1) {return null;}BitmapDrawable bitmapDrawable = (BitmapDrawable) context.getResources().getDrawable(drawableId);Bitmap bitmap = bitmapDrawable.getBitmap();return bitmap;}/*** bitmap转换为drawable* @param bitmap* @return*/private static Drawable bitmap2Drawable(Bitmap bitmap) {if (bitmap == null) {return null;}Drawable drawable = new BitmapDrawable(bitmap);return drawable;}/*** 根据手机的分辨率从 dp 的单位 转成为 px(像素)*/private static int dip2px(Context context, float dpValue) {final float scale = context.getResources().getDisplayMetrics().density;return (int) (dpValue * scale + 0.5f);}}

使用方式如下

在图片上打印图片水印

        // 图片水印Drawable drawable = WatermarkHelper.getIntense(this).setSourceImage(R.drawable.bg).setWaterImage(R.drawable.icon).setWatermarkPosition(50,50).getMarkedImage(WatermarkHelper.WATERMARK_WITH_IMAGE);if (drawable != null) {image.setImageDrawable(drawable);}

在图片上打印文字水印

        // 文字水印Drawable drawable_text = WatermarkHelper.getIntense(this).setSourceImage(R.drawable.bg).setWatermarkTextSize(50).setWatermarkTextColor(Color.GRAY).setWatermarkTextPosition(50,50).setWatermarkText("雨幕青山").getMarkedImage(WatermarkHelper.WATERMARK_WITH_WRITE);if (drawable_text != null){image.setImageDrawable(drawable_text);}

在图片上打印图片和文字水印

        // 图片和文字水印Drawable drawable_img_text = WatermarkHelper.getIntense(this).setSourceImage(R.drawable.bg).setWatermarkTextSize(30).setWatermarkTextColor(Color.GRAY).setWatermarkTextPosition(80,55).setWatermarkText("雨幕青山").setSourceImage(R.drawable.bg).setWaterImage(R.drawable.icon).setWatermarkPosition(30,50).getMarkedImage(WatermarkHelper.WATERMARK_WITH_IMAGE_AND_WRITE);if (drawable_img_text != null){image.setImageDrawable(drawable_img_text);}

最后在贴一张在图片上打印图片和文字水印的效果图：

给图片打水印的工具类编写的比较简单，勉强能够使用，小伙伴们可以自己拓展一下功能。好了，希望这篇博客能够给小伙伴们提供一些帮助。

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android：给图片打水印

使用方式如下

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